JP4056938B2

JP4056938B2 - Food insulation box

Info

Publication number: JP4056938B2
Application number: JP2003162586A
Authority: JP
Inventors: 隆東野; 真一浦田; 彰三稲田
Original assignee: Zojirushi Corp
Current assignee: Zojirushi Corp
Priority date: 2003-06-06
Filing date: 2003-06-06
Publication date: 2008-03-05
Anticipated expiration: 2023-06-06
Also published as: JP2004358082A

Description

【０００１】
【発明の属する技術分野】
この発明は、給食サービス等に用いられる食品保温ボックスに関するものである。
【０００２】
【従来の技術】
給食サービス等に用いられる食品保温ボックスとして、保温性能の高い真空二重容器により外殻を形成することが従来から行われている（特許文献１参照）。真空二重容器を使用する場合、通常はこれを一端開放・他端閉塞の円筒形に形成し、その開放端に保温蓋を被せることにより食品保温ボックスの外殻が構成される。そして、内部に収納した飯椀や汁椀等の食品容器の出し入れの便宜上、真空二重容器を横倒し状態で使用できるように真空二重容器の開放端と閉塞端にそれぞれ支持枠を取付け、横倒し状態の真空二重容器を両方の支持枠で支持させ、側方の開放部から引き出し板を出し入れするようにしている。その引き出し板上に飯椀と汁椀を載せて真空二重容器内に差し込んで収納し、逆に引き出し板を引き出すことにより飯椀等を外部に取り出すようにしている（以下、引き出し型と称する。）。
【０００３】
また、携帯用ランチボックスにおいて、上端開放・下端閉塞の真空二重容器を用い、その上端開放端から食品容器を収納して内部で２段に重ね、上端開放部に断熱性の蓋を被せるものも知られている（特許文献２参照）。
【０００４】
【特許文献１】
特開２０００−１５２８８２号公報（図１、図２）
【特許文献２】
特開２００３−１４４２２１号公報（図７参照）
【０００５】
【発明が解決しようとする課題】
この種の食品保温ボックスは、食事を作ることが困難な状況にある老人や病弱者向けの給食用に用いられることが多いが、前述した従来の食品保温ボックスのように引き出し型の場合は、引き出し板上に食品容器を２個載せた状態で出し入れする必要があるために、その際に食品容器が倒れたり内部の食品をこぼしたりする不都合が生じやすく、取扱い性に問題があった。
【０００６】
また、前記特許文献２のように、真空二重容器を上端開放・下端閉塞の状態で使用し、上端の開放部から食品容器を出し入れすることも考えられるが、食品容器を上下２段に重ねて収納した場合、特に下段のものの出し入れが不便である問題がある。
【０００７】
そこで、この発明は保温性能の良好な真空二重容器を使用しつつ、前述のような不便がなく、使用性の良好な食品保温ボックスを提供することを課題とする。
【０００８】
【課題を解決するための手段】
前記の課題を解決するために、この発明は、ボックス底体上に２種類の食品容器を収納し、これらに被せた保温蓋を前記ボックス底体に結合するようにした食品保温ボックスにおいて、前記ボックス底体の上面に前記食品容器を上下２段に重ねて収納し、下段に収納される食品容器より浅い凹部を該ボックス底体の上面に設け、その凹部に嵌めた食品容器の容器蓋上部に他の食品容器を重ね、前記保温蓋を２段重ねの食品容器を覆う下端開放・上端閉塞の円筒形真空二重容器により形成し、該保温蓋上端面の一部を上段の食品容器の容器蓋に当接させ上下の食品容器間のすき間をなくした構成を採用した。
【０００９】
前記の構成によると、２種類の食品容器を上下２段に重ねてボックス底体上に収納しているので、下端開放円筒形の保温蓋を外すと食品食器のほぼ全体が現れる。このため各食品容器を両手で取扱うことができる。また、保温蓋は下端開放・上端閉塞であるので、上端開放或いは側面開放のものに比べ保温性にも優れる。その保温蓋の上端部を上段食品容器の容器蓋に当接させることにより上下の食品容器間のガタツキを防止し、同時に蓋の外れやずれ動きを防止する。
【００１０】
また、前記下段の食品容器の容器蓋に空気穴とその空気穴を囲んだ環状のつまみを設けるとともに、そのつまみを上段の食品容器の底面に当て、下段の食品容器の周壁上端部と上段食品容器の底面に設けた嵌合壁とを嵌合させた構成を採用することができる。この構成によると、下段の食品容器にみそ汁等の液体食品を収納した場合、内部の温度低下に伴う内圧の低下に伴なって容器蓋に設けた空気穴を通じて外部の空気が吸入されるので、内圧の低下を防ぐことができる。また、下段食品容器の周壁上端部と上段食品容器の嵌合壁との嵌合により、保温蓋を外した状態で上段の食品容器に外力が作用しても傾いたり、倒れたりすることを防止できる。前記空気穴は、搬送中に内圧が上昇することがあった場合に積極的にその部分から液体食品を流出させ、容器蓋の外周縁から漏れ出すことを防止する。空気穴から流出した液体食品はその周囲のつまみにより阻止され、内圧が低下すれば自然に空気穴から食品容器内に戻る。
【００１１】
前記上段の食品容器の容器蓋にベンディング性を付与し、前記保温蓋の上端面に設けた凹入部により該容器蓋を押圧するようにした構成を採用することができる。この構成によると、上段食品容器の容器蓋のベンディングにより、各食品容器の蓋がそれぞれ押圧されシールされる。また、下段の容器蓋のつまみが上段の食品容器の底面に押圧され液体に対するシール性が向上する。このため、前記空気穴から内部の液体食品が漏れることがあっても、つまみの上端周辺でシールされ、外部に漏れ出すことを防止する。
【００１２】
なお、前記ボックス底体に設けた下段食品容器用の前記凹部の底面と、該下段食品容器との間に弾性体を介在した構成や、前記上段食品容器の容器蓋と前記保温蓋との間に弾性体を介在した構成を採ることによっても、各蓋のシール性、及び前記つまみと上段食品容器底面との間のシール性を向上させることができる。
【００１３】
【発明の実施の形態】
以下、この発明の実施形態を添付図面に基づいて説明する。図１及び図２に示すように、第１実施形態の食品保温ボックスは、ボックス底体１とその上に被せられ、該ボックス底体１の外周面の段部２で支持される下端開放・上端閉塞の保温蓋３とからなる。
【００１４】
ボックス底体１は、底本体４の内部に発泡樹脂等の断熱材５を充填し、その下面を底板６で閉塞したものである。底本体４の上面には半球形の凹部７が形成され、外周面に前記の段部２が形成される。外周面の対称位置の２箇所に止め金具８、８が取付けられる。前記の凹部７は汁椀９（下段食品容器）より若干浅く形成され、該汁椀９の上端部１１がその上方に露出する。前記上端部１１は汁椀９を前記凹部７に収納した場合に垂直な壁面となる部分である。
【００１５】
前記の汁椀９はその下面に設けた浅い糸尻状のリブ１２が前記の凹部７の底面上に載る。また、汁椀９の湾曲部の上端と前記上端部１１の境界部分において、上端部１１の内面から内方に突き出した内方段部１３が形成され、椀蓋１４（容器蓋）がその内方段部１３上に嵌合する。またその内方段部１３の外面において、前記上端部１１の外面から内方に凹入した外方段部１５が形成される。その外方段部１５は前記凹部７の上端縁に載る。前記の椀蓋１４の中央部には空気穴１６が設けられ、その空気穴１６の外周に上方に突き出した環状のつまみ１７が形成される。つまみ１７に囲まれた椀蓋１４の部分は中央の空気穴１６の部分が低くなるように全体的に凹入している。
【００１６】
前記の汁椀９の椀蓋１４上に飯椀１８（上段食品容器）が積み重ねられる。飯椀１８は、底面１９の外周部下端に浅い嵌合壁２１（高さ約５ｍｍ）を設けている。その嵌合壁２１は前記汁椀９の上端部１１の内周面に所要のすき間をおいて嵌合する。またその底面１９の中央部において前記のつまみ１７が当接する。上端部１１の上端も飯椀１８の底面外周に設けた段部２０に当接するが、この当接部分は保温蓋３が被せられる前は微小すき間ｅが存在し、つまみ１７の底面１９に対する当接を妨げない。
【００１７】
飯椀１８の椀蓋２２は、上方に幾分膨出した湾曲面を有するベンディング性のあるものであり、同芯円状の環状のつまみ２３が形成される。この椀蓋２２の中心部に保温蓋３の凹入部２６が当接し、該椀蓋２２をベンディングさせ飯椀１８を前記の微小すき間ｅの分だけ押し下げてその底面外周部の段部２０を汁椀９の上端部１１に当接させる（図１はこの当接状態を示している）。これと同時に汁椀９の椀蓋１４のつまみ１７と底面１９との当接面に押圧力を加えるとともに、椀蓋１４外周縁の段部１３に対する嵌合部分にも押圧力を加える。なお、椀蓋２２をベンディングさせて飯椀１８を前記のように押し下げた場合、段部２０を上端部１１に当接させる必要は必ずしもなく、前記ｅより小さい微小すき間が残ってもよい。
【００１８】
つまみ１７の底面１９に対する当接面は成形精度が比較的ラフであるため、つまみ１７をその底面に押圧した場合、空気の流通は阻害されないが液体食品の通過はそれ自身の表面張力で阻止される。このように空気の流通は阻害されず、液体食品の通過を阻止する関係は、外周部の上端部１１と段部２０との当接部においても同様である。
【００１９】
保温蓋３は、真空二重容器により構成され、下端開放・上端閉塞の円筒形に形成され、下端開口部の外周面に環状部材２４が強制嵌合により一体化される。その環状部材２４の外周面の対称位置に設けられた突起２５、２５に対し、前記の止め金具８、８が係合され、ボックス底体１と保温蓋３とが着脱自在に連結される。また、保温蓋３の上端面中央部には内方に窪んだ前述の凹入部２６が形成され、その中央部に真空排気に使用したチップ管２７の切断端部が存在し、チップ管カバー２８によりカバーされる。そのチップ管カバー２８の内部にはシリコンシーラント等のシール材２９が充填される。保温蓋３の上端外周面に蓋部材３１がシリコンシーラント等のシール材を介在して強制嵌合されて、この蓋部材３１によりチップ管カバー２８は隠蔽される。蓋部材３１の上面に下向きコの字形の取手３２が固着される。前記の底板６には取手３２が嵌合可能な円形凹部３３が設けられ、積み重ねた際の相互に嵌合できるようになっている。
【００２０】
なお、汁椀９、飯椀１８の外周面と保温蓋３内周面との間のすき間は、保温蓋３を開ける際に発生する負圧により、飯椀１８等が持ち上がる不都合を無くするために、２ｍｍ以上必要である。
【００２１】
第１実施形態は以上のようなものであり、給食センター等で調理されたみそ汁を汁椀９に入れ椀蓋１４を被せてボックス底体１の凹部７に載せる。その上に御飯を入れた飯椀１８の底面をつまみ１７上に載せるとともに、嵌合壁２１を上端部１１の内周面に嵌合させる。その後保温蓋３を被せ、その下端の環状部材２４をボックス底体１の段部２に載せる。止め金具８、８を突起２５、２５に係止させると、保温蓋３がボックス底体１に連結される。保温蓋３の内部においては、その上端の凹入部２６が飯椀１８の椀蓋２２を押圧しこれをベンディングさせる。そのベンディングにより前述のように飯椀１８の底面の段部２０が汁椀９の上端部１１に当接又は微小すき間を残して接近し、飯椀１８の底面１９がつまみ１７に押圧される。同時に椀蓋１４の外周縁が段部１３に押圧される。
【００２２】
上記のような収納状態で搬送等される途中において、時間の経過とともに汁椀９内の温度が低下し内圧が低下すると、保温蓋３内の空気が上端部１１と段部２０との当接部分、つまみ１７と底面１９との当接部分の僅かなすき間を通り、空気穴１６から内部へ吸入される。これにより汁椀９内圧上昇が防止される。
【００２３】
また、汁椀９に関し、搬送中における傾きの発生や、椀蓋１４に加わる衝撃による内圧の上昇等があっても、椀蓋１４は前記の押圧力が作用しているため持ち上げられることはなく、その外周縁から液体食品が漏れ出すことはない。また、空気穴１６から液体食品が漏れ出すことがあっても、つまみ１７の底面１９に対する当接部のすき間において表面張力により流出が阻止され外部に漏れ出すことはない。空気穴１３から漏れ出した液体食品は、つまみ１７に囲まれた椀蓋１４の部分の凹入形状に沿って空気穴１６から汁椀９内に戻される。
【００２４】
給食を受けた者は、保温蓋３を開けると、ボックス底体１上に汁椀９と飯椀１８が２段に積み重なった状態で現れるので、必要に応じて両手を使用してこれらを膳等に移し変える。食事が終わった後の片付けは逆の手順による。汁椀９の椀蓋１４は空気穴１６の存在により内圧の低下が防止されるので容易に開放することができる。また、搬送中において、その空気穴１６は周囲のつまみ１７と底面１９との当接部でシールされるので、空気穴１６の存在による液体食品の温度低下が防止される。
【００２５】
前記のベンディング性ある椀蓋２２を用いる代わりに、図３に示した第２実施形態のように、椀蓋２２’は平坦な通常の厚さの蓋とし、前記ボックス底体１の凹部７の底面にパッキン取付け部３４を設け、その内周面に環状のパッキン３５を装着し、これを汁椀９の底面との間に介在させる。汁椀９はこのパッキン３５を介して支持され、前記凹入部２６が飯椀１８の椀蓋２２’に押圧される力をこのパッキン３５で受け、前記つまみ１７と底面１９との当接部に押圧力を及ぼし、その部分の液体に対するシール性を上げる。その他の構成は前記の第１実施形態の場合と同様である。
【００２６】
また、図４に示した第３実施形態は、前記のパッキン３５に代えて、飯椀１８の椀蓋２２’の中央部に穴３６を設け、その穴３６に装着したパッキン３７を保温蓋３の凹入部２６に押圧させたものである。この場合も、前記つまみ１７と底面１９に押圧力を及ぼしてシール性を上げる。その他の構成は第１実施形態の場合と同様である。
【００２７】
以上の各実施形態は、上下２段の食品容器が汁椀９、飯椀１８である場合の例であるが、一般に下段の食品容器は液体食品用、上段の食品容器は固体食品用とすることができる。
【００２８】
【実施例】
下端開放・上端閉塞の前記保温蓋３（実験例）と、下端閉塞・上端開放の真空二重容器（ランチジャー等で使用されているもの）（比較例）の保温効果を比較するため、次の実験を行った。
【００２９】
実験内容：内部に２段に重ねた食品容器にそれぞれ８５℃の湯を２００ｃｃ入れ、１時間ごとの湯の温度を測定した。
実験結果：表１に比較例及び実験例の実験結果を示す。
【００３０】
【表１】

【００３１】
【発明の効果】
以上のように、この発明の食品保温ボックスは、ボックス底板上に２段に積み重ねた食品容器に下端開放・上端閉塞の保温蓋を被せたものであるから、その保温蓋を外すと食品容器のほぼ全体が露出する。これにより、必要に応じて両手を使うなどして確実に取扱うことができ、食品容器を傾けたり倒したりする不都合が解消される。また、保温蓋は下端開放型であるので保温効果においても優れている。さらに、保温蓋の上端部内面の一部を上段食品容器の容器蓋に押圧させることにより、食品容器相互間にガタツキを防止することができる。また、下段食品容器が液体食品用である場合、その容器蓋に空気穴を設けその周囲に設けたつまみを上段食品容器の底面に当接させシールを図ることが行われるが、前記保温蓋による押圧にベンディング性の容器蓋等による弾性力を付加することにより、つまみの当接部に押圧力を及ぼすと同時に寸法誤差も吸収できるのでシール性が一層向上する。
【図面の簡単な説明】
【図１】第１実施形態の断面図
【図２】同上の分解斜視図
【図３】第２実施形態の断面図
【図４】（ａ）第３実施形態の一部断面図
（ｂ）（ａ）図の一部斜視図
【符号の説明】
１ボックス底体
２段部
３保温蓋
４底本体
５断熱材
６底板
７凹部
８止め金具
９汁椀
１１上端部
１２リブ
１３内方段部
１４椀蓋
１５外方段部
１６空気穴
１７つまみ
１８飯椀
１９底面
２０段部
２１嵌合壁
２２椀蓋
２３つまみ
２４環状部材
２５突起
２６凹入部
２７チップ管
２８チップ管カバー
２９シール部材
３１蓋部材
３２取手
３３円形凹部
３４パッキン取付け部
３５パッキン
３６穴
３７パッキン[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a food heat insulation box used for a meal service or the like.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a food heat insulation box used for a meal service or the like, an outer shell is formed by a vacuum double container having a high heat retention performance (see Patent Document 1). When a vacuum double container is used, it is usually formed in a cylindrical shape with one end open and the other end closed, and the open end is covered with a heat insulating lid to form the outer shell of the food heat insulating box. And, for convenience of putting in and out food containers such as rice bowl and soup bowl stored inside, support frames are attached to the open end and closed end of the vacuum double container so that the vacuum double container can be used in a laid state. The vacuum double container in the state is supported by both support frames, and the drawer plate is taken in and out from the open side. A rice bowl and a soup bowl are placed on the drawer plate and inserted into a vacuum double container for storage, and the rice bowl or the like is taken out by pulling out the drawer plate (hereinafter referred to as a drawer mold). .)
[0003]
In addition, a portable lunch box that uses a vacuum double container with an open top and a closed bottom, stores food containers from the open top of the container, stacks them in two layers, and covers the open top with a heat insulating lid Is also known (see Patent Document 2).
[0004]
[Patent Document 1]
Japanese Unexamined Patent Publication No. 2000-152882 (FIGS. 1 and 2)
[Patent Document 2]
JP 2003-144221 A (see FIG. 7)
[0005]
[Problems to be solved by the invention]
This type of food insulation box is often used for meals for the elderly and the sick who are difficult to make meals, but in the case of a drawer type like the conventional food insulation box mentioned above, Since it is necessary to take out and put in two food containers on the drawer plate, there is a problem in handling that the food container tends to fall over or spills the food in the interior.
[0006]
In addition, as in Patent Document 2, it is conceivable to use a vacuum double container with the upper end opened and the lower end closed, and the food container can be taken in and out from the open part at the upper end. In particular, there is a problem that it is inconvenient to put in and take out the lower one.
[0007]
Accordingly, an object of the present invention is to provide a food heat insulation box having good usability without using the above-mentioned inconvenience while using a vacuum double container having good heat insulation performance.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a food warming box in which two types of food containers are housed on a box bottom body, and a heat insulation lid placed thereon is coupled to the box bottom body. The food container is stored in two upper and lower layers on the upper surface of the box bottom body, and a concave portion shallower than the food container stored in the lower stage is provided on the upper surface of the box bottom body, and the container lid upper portion of the food container fitted in the concave portion Another food container is stacked on top of each other, and the heat insulating lid is formed by a cylindrical vacuum double container having an open bottom and a closed upper end covering the two layers of food containers, and a part of the upper end surface of the heat insulating cover is formed on the upper food container. A configuration was adopted in which the gap between the upper and lower food containers was eliminated by contacting the container lid.
[0009]
According to the above-described configuration, two types of food containers are stacked in two upper and lower stages and stored on the bottom of the box, so that the entire food tableware appears when the bottom-open cylindrical heat insulating lid is removed. For this reason, each food container can be handled with both hands. In addition, since the heat insulating lid is open at the lower end and closed at the upper end, it is superior in heat retention as compared with the one with the upper end opened or the side opened. The upper end portion of the heat retaining lid is brought into contact with the container lid of the upper food container, thereby preventing rattling between the upper and lower food containers, and at the same time preventing the lid from coming off and moving.
[0010]
In addition, an air hole and an annular knob surrounding the air hole are provided in the container lid of the lower food container, the knob is applied to the bottom surface of the upper food container, the upper end of the peripheral wall of the lower food container and the upper food The structure which fitted the fitting wall provided in the bottom face of the container is employable. According to this configuration, when liquid food such as miso soup is stored in the lower food container, external air is inhaled through the air hole provided in the container lid as the internal pressure decreases due to the internal temperature decrease. A decrease in internal pressure can be prevented. In addition, by fitting the upper end of the peripheral wall of the lower food container with the fitting wall of the upper food container, it prevents tilting or falling even if an external force is applied to the upper food container with the heat insulation lid removed. it can. The air hole prevents liquid food from actively flowing out from the portion when the internal pressure increases during conveyance, and preventing leakage from the outer peripheral edge of the container lid. The liquid food that has flowed out of the air hole is blocked by the surrounding knob, and when the internal pressure decreases, it naturally returns from the air hole into the food container.
[0011]
It is possible to adopt a configuration in which bending is imparted to the container lid of the upper food container and the container lid is pressed by a recessed portion provided on the upper end surface of the heat retaining lid. According to this structure, the lid of each food container is pressed and sealed by bending the container lid of the upper food container. Moreover, the lower container lid knob is pressed against the bottom surface of the upper food container to improve the sealing performance against the liquid. For this reason, even if the liquid food inside leaks from the air hole, it is sealed around the upper end of the knob to prevent it from leaking outside.
[0012]
In addition, the structure which interposed the elastic body between the bottom face of the said recessed part for lower food containers provided in the said box bottom body, and this lower food container, Between the container lid and the said heat insulation cover of the said upper food container Also, by adopting a configuration in which an elastic body is interposed, the sealing performance of each lid and the sealing performance between the knob and the bottom surface of the upper food container can be improved.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIGS. 1 and 2, the food warming box of the first embodiment is covered with a box bottom body 1 and the upper end thereof, and is supported by a step 2 on the outer peripheral surface of the box bottom body 1. It consists of a heat retaining lid 3 with an upper end closed.
[0014]
The box bottom body 1 is obtained by filling a bottom main body 4 with a heat insulating material 5 such as a foamed resin and closing the lower surface with a bottom plate 6. A hemispherical recess 7 is formed on the upper surface of the bottom body 4, and the step 2 is formed on the outer peripheral surface.

Fasteners

8 and 8 are attached to two locations on the outer peripheral surface at symmetrical positions. The recess 7 is formed slightly shallower than the soup bowl 9 (lower food container), and the upper end portion 11 of the soup bowl 9 is exposed above. The upper end portion 11 is a portion that becomes a vertical wall surface when the soup bowl 9 is stored in the concave portion 7.
[0015]
The soup bowl 9 has a shallow thread-like rib 12 provided on the lower surface thereof placed on the bottom surface of the recess 7. In addition, an inner step portion 13 projecting inward from the inner surface of the upper end portion 11 is formed at the boundary portion between the upper end of the curved portion of the soup bowl 9 and the upper end portion 11, and the lid 14 (container lid) is included therein. It fits on the step 13. Further, an outer step portion 15 that is recessed inward from the outer surface of the upper end portion 11 is formed on the outer surface of the inner step portion 13. The outer step portion 15 rests on the upper edge of the recess 7. An air hole 16 is provided in the central portion of the lid 14, and an annular knob 17 protruding upward is formed on the outer periphery of the air hole 16. The portion of the lid 14 surrounded by the knob 17 is generally recessed so that the central air hole 16 is lowered.
[0016]
Rice bowl 18 (upper food container) is stacked on the lid 14 of the soup bowl 9. The rice bowl 18 is provided with a shallow fitting wall 21 (height: about 5 mm) at the lower end of the outer peripheral portion of the bottom surface 19. The fitting wall 21 is fitted to the inner peripheral surface of the upper end portion 11 of the soup bowl 9 with a required gap. The knob 17 abuts at the center of the bottom surface 19. The upper end of the upper end portion 11 also comes into contact with the step portion 20 provided on the outer periphery of the bottom surface of the rice bowl 18, but this contact portion has a minute gap e before the heat insulating lid 3 is covered, Does not interfere with contact.
[0017]
The lid 18 of the rice bowl 18 has a bending property having a curved surface slightly bulging upward, and a concentric circular knob 23 is formed. The recessed portion 26 of the heat insulating lid 3 is brought into contact with the center portion of the lid lid 22, the lid lid 22 is bent, the rice bowl 18 is pushed down by the minute gap e, and the step portion 20 on the outer peripheral portion of the bottom surface is poured. It is made to contact | abut to the upper end part 11 of the collar 9 (FIG. 1 has shown this contact state). At the same time, a pressing force is applied to the contact surface between the knob 17 and the bottom surface 19 of the jar lid 14 of the soup bowl 9, and a pressing force is also applied to the fitting portion of the outer peripheral edge of the jar lid 14 with the step portion 13. When the rice lid 18 is pushed down as described above by bending the lid 22, it is not always necessary to bring the step portion 20 into contact with the upper end portion 11, and a small gap smaller than e may remain.
[0018]
The contact surface of the knob 17 with respect to the bottom surface 19 is relatively rough in molding accuracy. Therefore, when the knob 17 is pressed against the bottom surface, air flow is not hindered, but the passage of liquid food is blocked by its own surface tension. The Thus, the flow of air is not hindered, and the relationship for preventing the passage of liquid food is the same in the contact portion between the upper end portion 11 of the outer peripheral portion and the step portion 20.
[0019]
The heat insulating lid 3 is constituted by a vacuum double container, is formed in a cylindrical shape with the lower end opened and the upper end closed, and the annular member 24 is integrated with the outer peripheral surface of the lower end opening by forced fitting. The

stoppers

8 and 8 are engaged with the

protrusions

25 and 25 provided at symmetrical positions on the outer peripheral surface of the annular member 24, and the box bottom body 1 and the heat insulating lid 3 are detachably connected. Further, the above-described recessed portion 26 that is recessed inward is formed in the central portion of the upper end surface of the heat insulating lid 3, and the cut end portion of the tip tube 27 used for evacuation is present in the central portion, and the tip tube cover 28. Covered by. The tip tube cover 28 is filled with a sealing material 29 such as silicon sealant. The lid member 31 is forcibly fitted to the outer peripheral surface of the upper end of the heat retaining lid 3 with a sealant such as silicon sealant interposed therebetween, and the tip tube cover 28 is concealed by the lid member 31. A downward U-shaped handle 32 is fixed to the upper surface of the lid member 31. The bottom plate 6 is provided with a circular recess 33 into which the handle 32 can be fitted so that they can be fitted to each other when stacked.
[0020]
The clearance between the outer peripheral surface of the soup bowl 9 and the rice bowl 18 and the inner peripheral face of the heat insulating lid 3 is to eliminate the disadvantage that the rice bowl 18 and the like are lifted by the negative pressure generated when the heat insulating lid 3 is opened. In addition, 2 mm or more is necessary.
[0021]
The first embodiment is as described above. Miso soup cooked in a lunch center or the like is placed in a soup bowl 9 and covered with a lid 14 and placed in the recess 7 of the box bottom body 1. The bottom surface of the rice bowl 18 containing rice is placed on the knob 17 and the fitting wall 21 is fitted to the inner peripheral surface of the upper end portion 11. Thereafter, the heat insulating lid 3 is covered, and the annular member 24 at the lower end thereof is placed on the step portion 2 of the box bottom body 1. When the

stoppers

8 and 8 are locked to the

protrusions

25 and 25, the heat insulating lid 3 is connected to the box bottom body 1. In the inside of the heat insulating lid 3, the recessed portion 26 at the upper end presses the lid 22 of the rice bowl 18 to bend it. By the bending, the step portion 20 on the bottom surface of the rice bowl 18 comes into contact with the upper end portion 11 of the soup bowl 9 or leaves a small gap, and the bottom surface 19 of the rice bowl 18 is pressed against the knob 17. At the same time, the outer peripheral edge of the lid 14 is pressed against the step portion 13.
[0022]
When the temperature in the soup bowl 9 is lowered and the internal pressure is lowered with the passage of time while being transported in the storage state as described above, the air in the heat insulating lid 3 is brought into contact with the upper end portion 11 and the stepped portion 20. The air is sucked into the air hole 16 through a small gap at the contact portion between the knob 17 and the bottom surface 19. Thereby, the internal pressure rise of the soup bowl 9 is prevented.
[0023]
Further, regarding the soup bowl 9, even if there is an inclination during conveyance or an increase in internal pressure due to an impact applied to the lid lid 14, the lid lid 14 is not lifted because of the pressing force described above. Liquid food will not leak from its outer periphery. Even if liquid food leaks from the air hole 16, the outflow is prevented by the surface tension in the gap of the contact portion with the bottom surface 19 of the knob 17, and does not leak to the outside. The liquid food leaking from the air hole 13 is returned from the air hole 16 into the soup bowl 9 along the recessed shape of the portion of the lid 14 surrounded by the knob 17.
[0024]
When the person who has received the meal opens the heat insulation lid 3, the soup bowl 9 and the rice bowl 18 appear in a two-tiered state on the box bottom 1, so that they can be removed using both hands as necessary. And so on. Cleaning up after the meal is done is the reverse procedure. The lid 14 of the soup bowl 9 can be easily opened because the decrease in internal pressure is prevented by the presence of the air holes 16. Further, during transportation, the air hole 16 is sealed at the contact portion between the surrounding knob 17 and the bottom surface 19, so that the temperature drop of the liquid food due to the presence of the air hole 16 is prevented.
[0025]
Instead of using the bendable lid 22 described above, as in the second embodiment shown in FIG. 3, the lid 22 ′ is a flat lid having a normal thickness, and the concave portion 7 of the box bottom body 1 is formed. A packing mounting portion 34 is provided on the bottom surface, and an annular packing 35 is mounted on the inner peripheral surface thereof, and this is interposed between the bottom surface of the soup bowl 9. The soup bowl 9 is supported via the packing 35, and the recess portion 26 receives a force by which the recessed portion 26 is pressed against the bowl lid 22 'of the rice bowl 18 by the packing 35, so that the contact portion between the knob 17 and the bottom surface 19 is received. A pressing force is applied, and the sealing performance of the portion against the liquid is increased. Other configurations are the same as those in the first embodiment.
[0026]
In the third embodiment shown in FIG. 4, instead of the packing 35, a hole 36 is provided in the center portion of the rice lid 18 ′ of the rice bowl 18, and the packing 37 attached to the hole 36 is replaced with the heat retaining lid 3. The concave portion 26 is pressed. Also in this case, a pressing force is applied to the knob 17 and the bottom surface 19 to improve the sealing performance. Other configurations are the same as those in the first embodiment.
[0027]
Each of the above embodiments is an example in which the upper and lower two-stage food containers are soup bowl 9 and rice bowl 18, but generally the lower food container is for liquid food, and the upper food container is for solid food. be able to.
[0028]
【Example】
In order to compare the thermal insulation effect of the heat insulation lid 3 (experimental example) with the lower end open / top end closed and the vacuum double container (used in a launcher) with the lower end closed / upper end open (comparative example) The experiment was conducted.
[0029]
Experiment contents: 200 cc of 85 ° C. hot water was added to each food container stacked in two stages, and the temperature of the hot water was measured every hour.
Experimental results: Table 1 shows the experimental results of the comparative example and the experimental example.
[0030]
[Table 1]

[0031]
【The invention's effect】
As described above, the food heat insulation box of the present invention is such that the food container stacked in two stages on the box bottom plate is covered with the heat insulation lid with the lower end opened and the upper end closed. Almost the whole is exposed. As a result, it can be handled reliably by using both hands as necessary, and the inconvenience of tilting or tilting the food container is eliminated. Further, since the heat insulating lid is an open type at the lower end, the heat insulating effect is excellent. Furthermore, rattling between food containers can be prevented by pressing a part of the inner surface of the upper end of the heat retaining lid against the container lid of the upper food container. Further, when the lower food container is for liquid food, an air hole is provided in the container lid, and a knob provided around the container is brought into contact with the bottom surface of the upper food container for sealing. By applying an elastic force by a bendable container lid or the like to the pressing, a pressing force is applied to the contact portion of the knob, and at the same time, a dimensional error can be absorbed, so that the sealing performance is further improved.
[Brief description of the drawings]
FIG. 1 is a sectional view of a first embodiment. FIG. 2 is an exploded perspective view of the same. FIG. 3 is a sectional view of a second embodiment. FIG. 4 (a) is a partial sectional view of a third embodiment. (A) Partial perspective view of the figure [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Box bottom body 2 Step part 3 Insulation cover 4 Bottom main body 5 Thermal insulation material 6 Bottom plate 7 Recessed part 8 Stopper metal 9 Soup cup 11 Upper end part 12 Rib 13 Inner step part 14 Cover 15 Outer step part 16 Air hole 17 Knob 18 Rice bowl 19 Bottom surface 20 Step portion 21 Fitting wall 22 Cover 23 Knob 24 Annular member 25 Protrusion 26 Recessed portion 27 Tip tube 28 Tip tube cover 29 Seal member 31 Cover member 32 Handle 33 Circular recess 34 Packing attachment portion 35 Packing 36 Hole 37 Packing

Claims

In a food heat insulation box in which two types of food containers are stored on the box bottom body, and a heat insulating cover is attached to the box bottom body, the food container is placed in two upper and lower stages on the top surface of the box bottom body. A recess that is shallower than the food container stored in the lower tier is provided on the upper surface of the bottom of the box, and another food container is stacked on top of the container lid of the food container fitted in the recess. Formed by a cylindrical vacuum double container with the lower end open and the upper end closed to cover the stacked food containers. Food heat insulation box characterized by eliminating

The container lid of the lower food container is provided with an air hole and an annular knob surrounding the air hole, and the knob is applied to the bottom surface of the upper food container, and the upper end of the peripheral wall of the lower food container and the upper food container The food insulation box according to claim 1, wherein a fitting wall provided on the bottom surface is fitted.

The food product according to claim 1 or 2, wherein the container lid of the upper food container is provided with a bending property, and the container lid is pressed by a recessed portion provided on an upper end surface of the heat retaining lid. Insulation box.

The food heat retaining box according to any one of claims 1 to 3, wherein an elastic body is interposed between a bottom surface of the recess for the lower food container provided on the box bottom body and the lower food container. .

The food insulation box according to any one of claims 1 to 4, wherein an elastic body is interposed between the container lid of the upper food container and the insulation lid.